Correct

外壳

/ wàiké / 
Strokes

Definition

envelope/outer shell/hull/cover/case

Example

As a Noun

outer covering/casing; shell; case; crust; (external) husk

1
Zhèzhǒng
这种
jiǎchóng
甲虫
yǒu
有
jiānyìng
坚硬
de
的
wàiké
外壳
  
。

This kind of beetle has a hard shell.

2
Zhǒngzi
种子
de
的
wàiké
外壳

husk of a seed

3
Rèshuǐpíng
热水瓶
wàiké
外壳

outer casing of a thermos flask

4
Jīdàn
鸡蛋
wàiké
外壳

shell of an egg; egg shell

5
Diànshìjī
电视机
  
/
shǒubiǎo
手表
  
/
shǒujī
手机
wàiké
外壳

case of a TV set/wrist watch/mobile phone